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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Transom Angle		  New Topic  Topic Locked
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lancej
1st Mate

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81 Posts
Initially Posted - 06/09/2004 :  12:40:42  Show Profile
Does anyone know the designed angle of the transom to the waterline? I am designing a motor mount that will have angle correction for outboard biult in to the design, rather than having to shim the motor to get this relationship correct. Thanks!!
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 06/09/2004 :  13:02:39  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by lancej</i>
<br />Does anyone know the designed angle of the transom to the waterline? I am designing a motor mount that will have angle correction for outboard biult in to the design, rather than having to shim the motor to get this relationship correct. Thanks!!
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Lance,

I think it is fairly close to straight up and down.

You shouldn't have to shim the motor to get the right trim angle, but simply make a trim adjustment on the outboard to get the proper angle.
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 06/09/2004 :  13:48:10  Show Profile  Visit Douglas's Homepage
Most outboards have this featur built into them.
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RichardG
Admiral

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USA
990 Posts
Response Posted - 06/09/2004 :  19:37:25  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Most outboards have this featur built into them<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Even my old 1.5 hp air-cooled Eska has this feature built in, however it can't be adjusted completely vertical because the overhang is a bit too severe on my dinghy (but close enough).
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lancej
1st Mate

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81 Posts
Response Posted - 06/10/2004 :  05:55:26  Show Profile
Yes, most outboards have this feature, but my Evinrude Yachtwin 8 will not adjust quite far enough, and has a 3-4 degree angle to the water with the stock motor mount. THis leads to ineffective propulsion, especially in reverse, and more cavitation than desirable. The other option is a new outboard (with electric start) but I have to convince my wife....

Lance
85 sk/sr
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Bill Holcomb
Admiral

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USA
769 Posts
Response Posted - 06/10/2004 :  10:08:07  Show Profile
Regardless of engine Lance, the transom is pretty much vertical if the boat is floating on her lines. However, if everyone aboard is sitting at the extreme aft end of the cockpit........well, the transom will have a distinct aft rake.......

Bill Holcomb - C25 Snickerdoodle #4839
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lancej
1st Mate

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81 Posts
Response Posted - 06/10/2004 :  13:07:17  Show Profile
Yes the Transom angle is a constant here, I was just wondering if it was designed at perpendicular to waterline, which it looks at if it is. Many boats have a negative relief to them, but it is usually pronouced, like -10 degrees. The variable I think is the motor here, as apparently many motors can be adjusted for this, my particular motor will not allow for this amount of adjustment. I will design a motor bracket based on this configuration, which will put the motor back perpendicular to the waterline as it should be. Also I can design for more lift, which will allow me to get the prop further into the water.

Lance
85 fk/sr
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.